Plastic par lamp construction with reinforced recepticle area

Abstract

An improved plastic reflector member for a parabolic aluminized reflector (PAR) lamp is disclosed and, in particular, use of said improved plastic reflector member for an all plastic PAR lamp or a PAR lamp which uses said improved reflector member. Said improved plastic reflector member utilizes a variable thickness wall member to form the parabolic shaped cavity wherein the wall thickness is sufficiently greater in the apex region of said parabolic cavity than in the adjoining wall region to avoid mechanical and heat distortion.

What we claim as new and desired to secure by Letters Patent of the United States is: 
     
       1. In a rectangular shaped plastic reflector lamp comprising a plastic reflector member having a parabolic shaped cavity, one pair of opposing generally parallel planes which intersect the parabolic cavity to form the longer sides of said rectangular shape, a second pair of opposing generally parallel planes which intersect the parabolic cavity to form the shorter sides of said rectangular shape, all said planes terminating at a rectangular shaped sealing rim, receptacle means disposed on the rear side of said reflector which accommodates a prefocused plastic mount construction to locate a tungsten halogen lamp at the focus of said reflector and with said prefocused mount being sealed directly to the receptacle means of said reflector, said prefocused mount including at least two lead wires, at least two electrical connecting means joined one each to said lead wires, a hollow plastic block having mating parts defining a cavity for receiving said joined lead wires, an elastic polymer in the cavity of said block to provide a leak proof seal around the lead wires, wherein the mating parts of said block comprise an inner container member defining said cavity and fitted into an outer housing member, said inner and outer members being sealed together after assembly to form a leak proof enclosure, and said tungsten halogen lamp being externally connected to the end of said lead wires nearest to the focus of the reflector, the improvement wherein the wall thickness of the parabolic shaped cavity is sufficiently greater in the apex region of said parabolic cavity in a circular area commencing at the edge of the receptacle means and extending radially outward therefrom to avoid mechanical and heat distortion when the prefocused mount is sealed to the reflector as well as during subsequent lamp operation.